Best available cop



Dec. 4, 1928.

1,693,588 E. A. BOHLMAN CONDENSER nl'mlmmmulul-m y after vth'e Patented Dec. 4, 1928.

UNITED STATES .AND SUPPLY COMPANY,

PAT

CO NDENSER.

Application led August 15, 1924 My invention relates to condensers and has to do'more particularly with variable condensers with an air dielectric, such as are non7 in general use in radio receiving sets,

B and is of the type'in which the vrotary plate element is operatively loc-ated in position relativefto the fixed plates or stator 'element so'that the capacity of-the condenser may be made to vary in the desired' manner, and

l0 anv object of my invention is the provision of an improved variable condenser which is provided'with novel 'features of construction whichv produce a condenser ot'l simple c0nstruction and at the same' tinie'provifle an im- I proved condenserjivhich is 'mostettieient in its operationand isof'the'low loss type.

feature ofmy 'and spa'cefth'e plate'sff the'rotor -element to orm a unit strueturenand also the plates' of the'iXed prfls'ta'tor element'of my condenser to formI fa unit structure# Y' f 1 `Another feature of'n'iy invention isthe provision of :a Vve-Inier 'element for my condenser which 'comprises' a. p1ate member which 'is loosely .supported on lthe rotatablef'shzift or' the rotor element and the means'proi'ided for rotglting' thevernier plate independent'of the rotor element' to obtain aL-fineradjustment -rotor element has been adjusted vitl'iout disturbing: the' adjustment-of the rotor element'. f v

` 'Still'f ntlienfeatnre ofjiny invention is the provisionjofmeansffor rotatably support` ing the actuatingelement of tlie'vernier and the frictional mee'ns'for maintaining the vernier'ele'ment in its adjustedl position.

The bo've'features as `Well as others not specifically pointed out, will he pointed out .inthe ensuingspe'cificatin, and for abe-titer understanding off-my "invention 'reference may be had tothe accompanying drawing, in which. like reference characters in the several viewsdenotelike .parts and in 'whichz Fig. 1 is :in elevation ofthe condenser of my invention;

Fig. 2 is n planviewof Fig. 1

A Fig 3 a left side vieivrof Fig. l

ig. 4 isa sectional'view alongT the line 4r `4 of l with certain parts broken :xn-'ay to clearl \'f. illustrate the 'construction of my condenser.

Fig. .5.j is a sectional view' 5-5 of Fig. l, and

Fig. 6 is e fragmentary alongY theline perspective view of invention 'is' the means S provided andthe manner'in'which I support Serial thestator elementS and "operable independent of and operatively `associated offthe stator element S. :i

lar plates 2 for spacing' operatively the;

formed of .'presently'be ENT oFFIcE.

ASSIGNOR TO KELLOGG NOIS, A CORPORATION 0 S WIT CHB OARD F ILLINOIS.

a l associatedrwith a. ver'nier'element V rotor element R with thefendplate -irr detail-i5 y theigter *elle ses e plurality of {semi-chou# suitable? material -such described.;

iivith' each? 'then em inf Spaced. relation -to seach portioi'1`3rgfor plates .2 and other and themeans providednto'n -accomplishl1 of sides ofthe and 9 of th and 117 of the m iviththeir =res eachother? th ing this'by means ofthe ing members 6 1A- 'plurality in the jsdes of. the-spacing: member-6,' the staggered relation to -eaeho notches' 10 and 11 are-also saidnotches@ andi-9 ther-.fimi and supportdescribed.

and`9 are' provided 1n Y Aplura. 'ty -in the spacing' and supporting :member e member 6 and member ember t7 are than the widtliofft the Eortionsd' slig tly 'smaller 1`O and 11 of the member 7 rdmdf-the: portions over the notches we v-'Z'Will position .8 =and= 9' of the member 6;'A Due to the fact thatthe portions alla = 'and 11'? are slightly :smaller-in of the notches. and 9, eetive spacingand `sup- I 5 a'. :pluralityfof re formed'l-opposite eachother to o assemble the. -s

per spacing distance between the tatorf' element-f S llo a predetermined number ot' plates 2 depending upon the rated capacity of the condenser are placed in a suitable vfixture to properly space the plates` 2 and properly align the plates 2'. A' pair of supporting and spacing inenibers 6 and 7 are now matched together as above described to forni thc 2. The matched members G :ind 7 are now placed on't-lie portions Bo one of the aligned group, with the body portions 14 andl5 betweeirjthc notclies-8 and 9, 10 and llof thel matched members 6 and-7 which are ot a size to fit in the aligncdslots 4 of the plates Qiestglin't-lie said: slots 41, the depth of the said slots 4'zbeiii'g such=as-to permit the edges il of the'pltestoi be substantially Ilusliwith tlieface lo the member 6 when the inembeis '6 andff inithzsaid shits-4. Heat) and a Suitableuisolder'is nowappliedto'the members 6 and 7 when in .their position iii-the'slots iasjus'deseribed causing the'solder to flow betrwenzt-HE members (if andi 7 and in` the 'notchesiand ofthe plate G-whicli serve as pockets m meivethe menen aider andiiiiows 'thefreqired- 'amount otsolder to-l'ow into the slots13 to'secre ftheiplatesto -tliezspaci'n' and supporting membersi' aridi?.I f The' notc iles l8 "and-Syd() 'andzlil ofithe respectivemeinbers fand? arie prlovidedwvithlv shaped extremities which @perniitithesohi'eriwhichis applied to 'fiatily ofw! btweenithime'mbers 6vaiid'7: to fsecir're'thein to 'Bhettwof other'` aligned i roup's oiireessesrogtheplates 2-larealso asociated" witzhal pair o members f6 and-7: and the gnetliochoii eciairingwthenr infixettrelation thb sttibor. plliltiesll. isf'thesamex as j u st d 90 the :plat/est ias just described the ipiiitesie of themes 'stifucturew'rhiehisoisubstdntial construction and 25 which-'Slots and`25 aire i'n alignment n whei'iiplatled in the? fixture to permit the saine to'reeeivethefiiienibers Gan and members` d'7 The platesQO 6 aiid'7 -are now securedpby 'means (it lieatand fluir 'solder as described' connection with the assembly of the stator eleslots 13 which are4 of a width of about the thickness of the platesY 135er A; semi-circulan dished4 .extension1 3 scribed. I Y Y z A; To assemble the stator clement- S, rotor 'elementR, andf fvernier elementV to for-in an -portedi Two 0,.

'; through Suita ment S and therefore a ui'ther description is not thought necessary. A disk 30 is provided which is adapted to engage the top plate 20 of the rotor element R and its peripheraledge is also adapted to ends of the iiienibcr 7. The disk 250 is provided with a hub iiieiiiber 3l integrally 'formed therewith which is provided wit-li a central orifice 32 in alignment with the orifices Z2 in the extended-portions 2l of the plates 20 of the assembled rotoreleiiicnt R and which lates .20 are properly spaced in relation to each other by means of the spacing and supporting,Y members (i and 7 as described in oonnection with the stator element S to ormfa unit; structure which is-ofY substantial construction a-nd at all timos maintains the plates 20 0ftlie rotor'el'ement in spaced relation with eachother. y l l From 4the. foregoing it; will-bcfappareiit that by providing the platesv with notchesa-,nd placingv the spacingstrips in the nothcst-hat the overall-size of the plates maybe reduced. it is also obvious inrespect toutherotary pla-ties` that by usingathis nietliodzofconstruct-ion that the amountfthat itis necessary to cut away the-stationaryplates tojpermit the rotary plates to operatcisinateriallyrre duced. f.. .,A 5,.. I.. v.'1`hevernier. element-Hypoxi; rises af's'eniicircular plate member fproyided'witha flange extensionf and-.withvanrintegrally formed narrow baiidf'( l:semi-circular in shape i which= flange extension.v is :a continuation loi the' langeextension 36 tot theyernier plate vof the plateis'connectedlby a webBQ which prevents saggingA of.

band 37'- o theplateA andalso; maintaining the rigidity of the band. The extension 38 of the plate 35 is providedgwitli anpriceO which isadapbed to'V receive the en d -41 of a-Acollar 42T which gend4l. spun. over to securetlie saine to the: eirtension: 38'.V The collar 42- isiproyide with algceiitialzori'fice 43 and a-circumferential groove44 andm'eaiis Afor associating. the yernier :plateplement V -wth the statorelementandthe' means for 1;

Iactuating this Vernier element Vgiiidepeigidcnt o' the rotorelement R .willfpreseiitly bedeoperating unit, I provide a ainofierid' plates 45 and 46 formed of lsuit-a le material-such as brass between, which `the apparatus'is'sup- 4 the respective members of the spacing and. supportinggmembers which are diametrically opposite-are pro il i vided with angular extensions 6 and2 to `which are secured insulating strips`47 and screws 49 and 5() which pass le orifices in the insulating th rea'd'cd en- 48 by means of strips 47 and 48 aiid have screw be soldered to the extended izo g suitable tapped orifices in the angular extensions 6 and 62 of the members The insulating strips 48 secured to the angular extensions 62 of the members 6 are now in turn secured to the bottom or end plat-e 46 by means of screws 51 which pass through suitable orifices in the end plate 46, insulating strips 48 and angular extensions 52 of the bridge members 52 and have screw threaded engagement with nuts 53 which secure the insulating strips 48 and bridge members=52 to the end plate 46. When the stator element S is in position on the insulating strips 48 and in turn secured to the plate 46 the rotor element R is now placed in position' with its pla-tes 20 disposed between the plates 2 of the stator element S and the Vernier plate 35 is'placed in positionbetween the stator plate. l ofl the stator element S and the end plate 46, With the rotor element R andthe' Vernier plate element V in position with the orifices 22 in t-he'fr'ot'or plate extensions: 21 and the orifice 43 in the collar'42 secured :to the vernie'rfplate' in alignment, the rotor shaft23' is'now inserted through the contrai'orifice'32iin'the hub p`o`rti0n311 of the aiisl'rf() .secured 't'oithe rotor; element R, aligned orifices 22i'n the plates 20 the central 'rifce'43. in the'co1la421vjth"it`s concave' end 6oA brehghr-w rest; inf la f'saitable orifice 6 14 in the'i'end plate 4 6 and in engagement with :1 b a'llv 62;"fThejb1l bearing 62'isheld engagement" with" 'thejeonca-Ve" end 60 of thel ls'ha'ftl'2i 'by' 'af spring nember 63 secured toiltlieendplate 46 'by-means of1 a. screw 64. With the eleiiien'tsiSg! R and? V lin this `position "the 'to' 'rllend p l'te -45 'i's placed? iny -position aff-Hai l argument with Ya'lrjfifjfiegj A. area-)nears apta adjusting sagra-agree tef- 167 'having gereset-riesame eaga'gaaenawiai thebringenembsfesaeis the ame fi'n as radjusted o sition in relation to the vconical eaafbrrhsius 'tsiatablaseews es pas;- Q'rifi'ces 'in Y-ftl'ietf'}` )'1a't;e445,` insulattlipis .arid ngl-riextensi'ons'fm? of i the bridge "neinb'ers 52 lh'av'e" screw threaded engagel'neiltK Vvitlr nts 69 Awhich"securethe top plate' 45 fin positi'n': :with -tlie `v stator 'elemeritfS'lin tui's'redto theinsulating' strips 47 and egthe saidstip insulating the' stator element Sffroin the 'endf'plates' 45"and Z46. 'Thve'urotor elementRis adjustablysecured to the' rotor shaft 23' againstf-"movement" relative thereto means' 'of-'a set screw V70vvhich has srevvfthreadd'egagement with a-suitable tapped orifice in' tliefliublffto Vlock-the rotor'v el'ementfR-On the"`s`aid' shaft 23j. f :T 'he i platesQfO'o'f the'rotorele'ment R may be-adjusted relative tothe platesfZof the' stator.` element-'Shy rotating 'the member' 65 Eto the right shitablc screws and '-its tis bifurcated is 'adapted fcumferential "ing the Vernier' fpo'sift'ions. 'To :ber Vrelat'i've ""e'lle'ine'nt iS If'provide ai rubber rimmed disk -tmmb'erSO slecured-to the Vernie-rl shaft `81. `Thel-yernier s' abl'edrificei'nf 4"-82 ofth'e end'platef45,=itsend81" resting in -a'sui'table orificei'n' 'an' arin '83 Whichiis'pivot- "ed to 'the Leshaped member/I5 'by means-'of a 'piv'otfpin '84%' 80""is'"adjustably l a'set screw 8 5 and when adjusted to'place the or lett as the ease may be and when the dosired adjustn'ient is obtained the lock nut 67 tightened down to hold the member 6.7 in adjusted position. The tension of the spring member 63 is sufficient to maintain the 7u roncal end ot thc hub 3l in constant en gagement with the adjustable member whereby the rot-or clement 1t is maintained in its longitudinally adjusted position. A screw 7l extends through an oritice in thtI 75 spring member 63 and has screw threaded engagement with a tapped orifice in the plate 46 for providing the proper amount of tension on the spring 63 so that the proper amount of Afriction is maintained between thc wi conical end ot the hub 31 and thc adjustable member 65 so that the rotor clement Rwill be held in any of-it's adjusted positions.

The 'Vernier element V is loosely supported on the rotor shaft 23, so that either may. be-s5 rotated independent of the other'and ,the means for actuating the Vernier element .Will new be described.v An L shaped member is secured to the inside face of the plate=46, by suitable screws the forward end ofi'which im is provided with an orifioe throughiwhieh the shaft 23 extends.- A spring member 76 has its one end secured to the member/75 by other end. 7T fvvhich to straddle: the. cir-i105 groove 44 in the collar'memher 42 secured to the Vernier' plate'35' andzits formed forlredend 77 en'gages'the face 78 of l,the groove 44 and the tension 'of the spring is su'cli as-'to maintain the bottom faceiof the 100 Collar member'42 against the member 75 so A"Lis'to'keep thel Vernier plate 35awa'yfrom the e` rot/or Ashaft "23 extending through" an en d platedffthetstator element'S'iahd at the same time providefrictional'mens .for Yholdplate235fin-anyofi'ts adjusted e105 rotate-'the vVernier plate memto the end vv'plate of the stator 81extends`throughfa suit- K110 ai] lintegrallyformed eitensign "The rubber rimmed :member 1.15

secured'on" theshaft 81 by member in engagement With theange 36 of 'thef Vernier plate' 35 andI lits' integrally 4formed semi-eircularfband 37 the setlscrewilzo 85 is tightened andunaintainsithe membeI'rS() 1n itsadjusted'positionfon the shaft- 811,i 'To 'maintain the rubber rimmedmember Stl'in ":frictional'engagementtwith the iange 36 of the Vernier plate v35 atall times and take-up "125 any Wear of the rubber which occurs I pro- 'Videla' h'elical'spring`l secured to the arm v83 and its Ycuredto the spring 76 86 onelend of Which'is other end se- *Tomountthe condenser of my invention to' 130 a suitable panel or suitable means l provide tions as come within the spirit and scope ot three thimbles 90 integrally formed with the the appended claims.

plate 45 provided with suitable tapped ori- What l claim as new and desire to secure liceswhich. are adapted to receive screws by United States Letters Patent 1s: c .f 6 which pass through orifices in the mounting l. ln a devine of the charaz'ter described 10 panel. The thimbles-SO also form means lor including :i pair of end plates, a stator elespacing the plate Llbf the condenser' a siiit ment and a rotor element, each oi said eleable distance from the panel. The rotor ments comprisinga plurality of plates,apai'r shaft 23 and vernici' shaft S1 will extend ct members, each of said members being pro- 10 through suitable orifices in the mounting vided with notched sides, the portions be- 75 panel-andthe collar 9i seeure l to tht` vernicitween said notch-es being less than the disshaft 81 will prevent longitudinal movement tance across said-notches, said members being of the Vernier shaft Sl. Suitable dials or adapted to bc placed together so that the control means will he secured to the protriidnotches ol one of said members are in staging ends of the shafts 23 and Si for rotating gered relation with the notches in the other 50 the rotor and Vernier elements R and Y. oi'f said members whereby the portions be To' adjust therotor element R relative to tween the notchesin one member cooperate the` stator clement S 'the dial. secured to' the with the notches in the other member toform rotor shaftflwill be grasped by. the operator slots to receive a. portion of; thevcircumfcrenl and: turned until the vproper .adjustment is tial edge of said plates whereby the said plates .5.

obtained; -Thisadjnstinent of the rotorA elcare supported.andseparated ronieaehother 1ment/Rrwill be held by the frictional engagen by a pair of'said. members, and meansirmed Imentibetween.the conical end-otthehubmemintegrally with certain..ofsaidmembers of --berfilandltliemember `(55. The recesses 5 in said stator element for supporting'saidstator the' plates-210ithe stator element S will per element between saidendrplates. y, f, llo mit/fth'ui rotation; of the rotor element R. 2. In a`device o the charaotefdescribedinf i Aften the oarsff adjustment olf the rotor cluding a pair oiend membrsa pluralityof 'element' Ri is. obtaineela4 finer adjustment may plates provided. with notches intheirfcircnmebeiobtiiie'diby; graspingthe dial `onthe verferentialedges, .a,'.pafir,iemhers, eaehjef w --nierfs'hatiandrotating 1t and asithe rubber said members :being.providedwitliinotehedffl" "rimmed-member 80-'is Secured-to the shalt Sl sides, said notches thesidesbfsaid .--aindfheldsin frictionalf engagement with the bers being in stagveredielation', Il'qi, i rl' i ns '.iangefti of vthewzerniei: plate 35 the Vernier between said notchesL l:being smallerthan the `plate-z isrotatedindependent of the adnotches, saidmembers beingplacedtfgethr -v '35"j'usted? rotor element R relative to. the end so that notches of oneof saidmembers are "0 plat'eof-tihe stator element` S and when the staggered relationto thevnotelieiinithe other properlad'justmentio' the` Vernier plate 35 is of said members whereby the, portions be- `obtainedi-it is heldin its adjusted position. by tweenv the notches'infone member', cooperate blieispvingi'ms beforedescribed. l withfthe notches in thabth'ermeinberto ortn :1:40 the-foregoing:description itinay v.be slotsito receive aportionf the circuinteiiei ies seen; tha-til have .designed a. condenserwhich tial edge of saidplatesgadj acentto-.the notches .is simple in construction; of .fewv parts vand therein,.the body portonsofsaidneinbers b- .venysimplefandeasily assembled'as the stator tween the said notclie's restingyin .tlie'notches .elementi Sandi-rotor .elementR zand Vernier .in said plates-'andineansformeddntgrally m -elementfViai-emll unit assembles which ,greatwith certain-.ot saiidgmeinbersfor supporting i n.

s'ly'aeilitate the assembly ofthe-entire device. certain ot said plates betweenfsaidg'endfmein- I I pnovidealsoa .novel and simple means for bers.v ,i 4 I. properly' spacing ftheplates ofiny condenser 3. In a. device of; the character described Ia'ndf-or.permanently:Securing them to their including a plurality ofplates, notches iiLthe n50 spacing .aiidfsupport'ing-members `thus' elimcircumerentialed-ges'of said plat'esa pair .iisI

'.inat'ing .any loss due-to poor contact between of members, notehescin'tlie sidesl ofeacli oil." I-tlierespcctiveplates; .Inalso provides novel saidv members, vsaid portions between.. 4said vernieriarrangement.inwhich I provide connotchesbeing smallerthanthe notches, said trolv means orobtaining'a very minute admembers being placed` together to, space the justment ozthe Vernier plate-relative to the notchesV of .thel respective, members. ini-io end. plate of the stator element S. The end staggered relation. witlreach. otlirwhereby plates 45 and! 4:6 4are/also -formed to protect the portions between said notchesin one niemthe plates ofthe condenser so that the saine Aber cooperatewiththelnoti'hesf inthe other may be handled without. the injuring ot the member to-form pairsiof' slots to. receive a plates. portionof the circumferential. edge o'f said. x25

I have..illustratedand described a preplates adjacent.to.-.said notches-therein, said ferr-'edv embodiment of my invention; it is slots being ofi-a size eqiialto` the vthickness of however understood that I do not Wish to the plates, said notchedfmembersadapted to be limited to the exact structure as shown but support and separate saidA plates;v the body 165. aimto. cover.- all suchchanges and modiiicaportion of saidmembersbetween said slotsqsu' one of said end in f Lacasse resting in the no tches in said circun'iferential edge of said plates. z f

4. A device ofthe character described including a 4pair of end plates, a stator element and af-.rotor element 'supported between said platesyashaft for rotating saidrotor element, a vernici'- platc element loosely'supported by said rotor shaft, a'second 'shaft 4supported by plates and a pivotedarm, a ricti'on ring securedto said second shaft, supporting means for pivotally supportingr said arm and means securedz to said arm and said supporting 'means Ifor frictionally holding said ring in engagement with said Vernier plate to rotate said Vernier element when said second shaft is rotated.

5. A device of the character described including a stator element and a rotor element, supporting plates for supporting said stator element and said rotor element, a shaft for rotating said rotor element, a Vernier plate element loosely supported on said shaft, a second shaft rotatably supported in one of said supporting plates and a pivoted arm, supporting means secured to the other of said supporting plates to which said arm is pivotally secured, a frictional ring secured to said second shaft, and a helical spring secured to said arm and sai supporting means for holding said friction ring in engagement with said Vernier plate to cause rotation of said vernier element when said second shaft is rotated.

6. In a device of the character described including a plurality of conducting plates, members placed together in pairs, each pair of said members being provided with notches, the notches in one side of each of said meinbers being in staggered relation with the notches in the other side of each of said members, and the portions between said notches being smaller in area than the said notches, said members adapted to be placed together so that the portions between the notches in one of said members cooperates with the notches in the other of said members to form slots, said slots being of a size equal to the thickness of said plates, and means formed with said plates substantially the same in size and shape as said slots for engaging said slots formed by said notches so that said plates are at right angles to said pairs of members and form a solid unitary structure with said members.

7. Iii a device of the character described including a plurality of conducting plates, a pair of members, provided with notches the area o f which is greater than the area of the portions between said notches, the notches in one side of each of said pair of members being in staggered relationwith .the notches in the other side of each of said members, said notches of said members when placed together adapted to cooperate with the portions between the notches of the other of said memarating said bers to form slots, and means substantially the same insize4 andshape'as said slots formed with said plates"forengagin`g Said'slots so that said lplates andjsaid members formf solid unitary structure a'i'idjsaid plates are at right angles to said'pairofmenibers andfparallel t`o each otherbutlzseparated*fijoineaeli other. y i if; a" ne; 8.' In'aideviceof the characterdescribedin# cluding a plurality' conductingfplates; members placedI tgeth f iifp'airs' andpro'l vided witlrnotche'd sides i ,zigzgfrelatio'ti tor nach other, 'the portions'*eeuwen=tliefehe being less in area than the area of the notches, said notches in one member adapted to cooperate with tlie portions between the notches in the other member to form slots'equal in width to the thickness of the plates, and means substantially the same in size and shape as said slots formed with said plates for engaging said slots in said pairs of members to form a solid unitarystructure, said slots being arranged so that said plates are separated from each other and parallel with each other. 9. A device of the chracter described including a plurality of plates, a pair of members having notches in their respective sides the poi-tions between said notches being less in area than the notches, placed together so that the notches in the sides of the respective members are in zigzag relation relative to each other and cooperate with the portion between the notches in the other member to form slots, so that two of said plates will enter slots formed by one notch and into slots formed by two adjacent notches, sa-id parts fitting snugly in said slots and forming a solid unitary structure therewith whereby said members support and separate said plates. y

10. A device of the character described including a rotary element and a stationary element, each of said elements comprising a plurality of conducting plates, members having notches in their respective 'sides in zigzag relation relative with each other, the portions between said notches being smaller in are'a than the notches, said members arranged in pairs so that said notches are inzigzagrelation relative to each other and cooperate with the portions between the notches in the other member to form slots for receiving and sepplates to form single mountable units, a pair of end plates, means formed 1ntegrally with certain of said members of said stator element for supporting said stator ele ment between said end plates, a shaft for rotatably supporting said rotor` element between said end plates in operative position with the plates of said stationary element.

l1. A device of the character described including a rotary element and a stationary element, each 0f said elements comprising a plurality of conducting plates, members having notches in their respective sides in zigzag relation with each other, said members aranged in pairs so that the said notches of :ach member are in zigzag relation relative to each other to form slots for receiving and separating said plates to forni single mountable units, a pair of end plates, means formed integrally with certain of Said members of said stator element Vfor supporting said stator element between said end plates, a shaft for rotatably supporting said rotor element between said end'plates in operative position with the plates of said stator element, a vernier plate element loosely supported on said shaft., means including a frictional means for rotating said Vernier' element independent of said rotor element, means for pivotally supporting said frictional means, and means for maintaining said rietional means in engagement with said Vernier plate element.

Signetl'by ine at Chicago, in the county of Cool; and State oit Illinois, this 13th day of August '1924.

ERNEST A. BOHLMAN. 

